You're over lit, not under lit. Traditional Poser without GC required some form of compensation, otherwise things appear too dark. So many Poser light sets are loaded with extra light in order to manually GC the image by throwing more light at it.

WIth GC, you're seeing what's really going on.

Thinking of GC as a hearing aid which corrects your inability to hear things. Think of light as the volume control on a stereo. Before you got the hearing aid, you cranked up the volume so you could hear music. But then you could not hear the telephone ringing, just the music, and you did not have a proper perception of the sound in the room. Things are out of balance.

Now you turn on your hearing aid (GC), which corrects the real problem - that you don't hear very well. (The actual problem is that monitors do not display dark things very well.) Suddenly the music is too loud! You must turn the stereo volume down after you get the hearing aid. Then you can hear the music and the telephone.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)